Effect of torso rotational strength on angular hip, angular shoulder, and linear bat velocities of high school baseball players
| Autor: | Nels H. Madsen, Jessica M. Szymanski, Ryan L. Schade, Joseph S. McIntyre, T. Jason Bradford, David J. Szymanski, David D. Pascoe |
|---|---|
| Rok vydání: | 2007 |
| Předmět: |
Male
medicine.medical_specialty Shoulder Adolescent Rotation Weight Lifting Treatment outcome Repetition maximum Physical Therapy Sports Therapy and Rehabilitation Squat Athletic Performance Baseball Bench press Sports Equipment Abdominal muscles medicine Humans Orthopedics and Sports Medicine Muscle Strength Abdominal Muscles Orthodontics Hip Physical Education and Training business.industry Resistance training General Medicine Torso Weight lifting Biomechanical Phenomena body regions medicine.anatomical_structure Treatment Outcome Physical therapy business human activities |
| Zdroj: | Journal of strength and conditioning research. 21(4) |
| ISSN: | 1533-4287 |
| Popis: | This investigation examined the effect of torso rotational strength on angular hip (AHV), angular shoulder (ASV), linear bat-end (BEV), and hand velocities (HV) and 3 repetition maximum (RM) torso rotational and sequential hip-torso-arm rotational strength (medicine ball hitter's throw) in high school baseball players (age 15.4 +/- 1.2 y). Participants were randomly assigned to 1 of 2 training groups. Group 1 (n = 24) and group 2 (n = 25) both performed a stepwise periodized resistance exercise program and took 100 swings a day, 3 days a week, for 12 weeks with their normal game bat. Group 2 performed additional rotational and full-body medicine ball exercises 3 days a week for 12 weeks. A 3RM parallel squat and bench press were measured at 0 and after 4, 8, and 12 weeks. Participants were pre- and posttested for 3RM dominant and nondominant torso rotational strength and medicine ball hitter's throw. Angular hip velocities, ASV, BEV, and HV were recorded pre- and posttraining by a motion capture system that identified and digitally processed reflective markers attached to each participant's bat and body. Groups 1 and 2 increased (p < or = 0.05) BEV (3.6 and 6.4%), HV (2.6 and 3.6%), 3RM dominant (10.5 and 17.1%) and nondominant (10.2 and 18.3%) torso rotational strength, and medicine ball hitter's throw (3.0 and 10.6%) after 12 weeks. Group 2 increased AHV (6.8%) and ASV (8.8%). Group 2 showed greater improvements in BEV, AHV, ASV, 3RM dominant and nondominant torso rotational strength, and medicine ball hitter's throw than group 1. Groups 1 and 2 increased predicted 1RM parallel squat (29.7 and 26.7%) and bench press (17.2 and 16.7%) strength after 12 weeks. These data indicate that performing additional rotational medicine ball exercises 2 days a week for 12 weeks statistically improves baseball performance variables. |
| Databáze: | OpenAIRE |
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